Electrical welding-machine.



W. G. WINFIELD ELECTRICAL WELDING MACHINE.

APPLICATION FILED AUG. 17. 1908.

Patented Sept, 28, 1909.

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W. G. WINFIELD. ELECTRICAL WELDING MACHINE.

' APPLIOATIONIILBDAUGJ'I,1908. 935,346.

Patented Sept. 23, 1909.

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INVEM'Pofi ATT ST- UNITED STATES PATENT ()FFICE.

WILLIAM C. WINFIELD, OF WARREN, OHIO.

ELECTRICAL WELDING-MACHINE.

Specification of Letters fPatent.

Patented Sept. 28, .1909.

Application filed August 17, 1908. Serial No. 448,799.

To all whom it may concern:

Be it known that I, WVILLIAM C. WINFIELD, a citizeuof the United States, residing at \Varren, in the county of Trumbull and State of Ohio, have invented certain new for welding small areas of surface at difiercut points simultaneously, all substantially as hereinafter described and more particularly pointed out in the claims.

The cost of welding by electricity is often prohibitive for certain classes of products, especially where light. gage material is used.

One of my objects is to provide means to reduce this cost to a minimum by eflecting a saving in electrical current and in reducing the area of the welds and the number of welding operations over a given area of surface.

A further object of the meansso provided is to minimize the danger of burning tlie material being welded and which danger is always a factor to be considered in welding light gage material. Again, as the welding occurs under pressure it is absolutely imperative to equalize the pressure over the different areas being welded so that uniform welding will occur at all contacted points at the same time. Thus, if weldingis taking place simultaneously at diiferent points under unequal pressures and contacts, one or more-welds will be unfinished or one or more will have burned through.

My invention contemplates the use of means for equalizing the pressure brou ht to bear upon the material bein wel ed, whether at one or more points and in making uniform contacts so that perfect welds will be obtained at different oints.

In the accompanying rawings, Figure 1 is a side. elevation of a hand operated machine embodying my invention, and Fig. 2 is afr'ont elevation thereof. Fig. 3 is a perspective view of two lapped pieces of metal showing two welds as produced by the means illustrated in Figs. 1 and 2'. Fig. 4 isa sectional view in part ofthe main working members seen in 1 and .2, but showing a longitudinal arrangement of the contact pins upon the mandrel or work support instead of transversely as in said figures, and Fig. 5 is an end and sectional view of the parts seen in Fig. 4. A pail or bucket is shown in said Figs. 4 and 5 as resting upon the contact pins with a supplemental ear piece laid thereon in welding position. Fig. 6 is a modification of a set of contact clamping members reversely arranged from the' showing of Figs. 1 and 2, and with threev contact pins instead of two. Fig. 7 is a bottom View of the rock member in Fig. 6 showing the staggered arrangement of the Contact pins. 4

e machine comprises a base-2adapted to be securely fastened or mounted upon a suitable bench or other support, and a standard 3 on said base having a forwardly projecting and vertically bored top portion 4 adapted to slidably support a vertically movable plunger 5 and a horizontal operating lever 6 pivotally engaged with the upper end of said plunger andpivotally mounted in ears or lugs 7 on said top portion. Lever 6 has a handle 8 at its front end and extends to the rear of its pivot support to hold a counterweightt, and it is through this lever that the operator brings pressure to bear upon the work during welding operations. The work is indirectly supported by a mandrel or arbor like member 10 rigidly mounted upon standard 3 at its front but insulated therefrom, and this member extends beneath plunger 5 and the rocking or equalizing head or member 11 thereon. Said-rock member 11 is in two parts and preferably of cop and has a ball connection 13 central at its top with plunger 5, whereby fre cm of movement and a tilting or rocking action is obtained which distributes the pressure from plunger 5'equally upon the work at difierent points dependent upon the number of contact "ins in use and their relative location to t e plunger axis. Thus, in Figs. 1 and 2, I Show a pair of copper contact ins 12 mounted in the upper side of man rel member 10 and these pins are arranged transversely of said member and are equally distant from the axial line of plunger 5. In Figs. 4 and 5 similar shown as arranged longitudinal y of mandrel 10 with the plunger centrally located above and between them. i I

Pins 12 actually so ort the work, and in Figs.-1 and 2 the wor is represented b two plates or strips P, which overlap an rest ins 12 are one upon the other and which joint or overlap is finally welded together as seen in Fig. 3, wherein the two stippled or dotted areas 14 serve to illustrate the extent of the welds produced by niy machine. The electrical current required for welding purposes is obtained by suitable connections 15 and 16, leading to the mandrel member 10 and rocking member 11, respectively. The means for controlling the current is not shown but it will be understood that it also is under the control of the operator.

In Figs. 4 and 5, a bail supporting 1nember 17 is arranged lengthwise upon the outside of a pail or bucket 18, and a double weld is produced opposite pins 12 when head 11 is lowered and pressure is brought to bear thereon and the current is flowing. The pressure beingequal by reason of the equalizing member, the same amount of current is passed through the material at both points opposite pins 12, and a pair of welded areas the same extent and of thesame character and uniformity is thereby produced and in the same intervalof time.

- The question of time in which the current is in, is important of course, but this is under the control of the operator and may be more or less dependent upon the kind of material in hand. But in any event, it is essential thatthe same amount of current shall pass through the immediate contacts, otherwise lmperfect work will be done. The pressure equalizing member provides for .uniform contact and pressures at two or more contact points and the welds thus produced are relatively small in area and approximately of the same size as the end of the contact pins 12 and which welds integrally unite the overlapped pieces of-metal at different points.

In Figs. 6 and 7, the rock member 20 shown therein is mounted on afixed or stationary ball support 21 with a series of three contact pins 22 projecting upwardly therefrom, and opposite a movable pressure contact member 23. Viewed in plan, pins 22 are oifset in respect to'each other and radially set in respect to the rock or tilting center.

It will be understood that rock members 11 and 20 are more or less frictionally held in place upon their respective ball connections by their fastening plates 28 and screws 29. This friction is sufiicient to hold the said members at any fixed relation to the work except when under pressureto accommodate inequalities in the work and in contacts. Obviously, said rock members might be definitely limited in their tilting or rock movements.

What I claim is 1. In electrical welding machines, a set of current conveying members having a pluralityof contacts between them, means to apply pressure to said members, and means to permit a universal movement between said members to produce a plurality of welds in one operation of the arts.

2. In electrical wel ing machines, a power member, current conveying contact members between which the work is introduced, one of said contact members having a universal connection with said power member, and one of said contact members having a plurality of contact. portions adapted to make a plurality of welds in a single operation of the parts.

3. In electrical welding machines, a movable power member and a current conveying contact member having a ball connection therewith, and a second current conveying member having a plurality of contact pins opposite said first contact member.

4. In an electrical weldingmachine, means comprising a ball jointed equalizing device and contacts for welding relatively small areas of metal at different points simultaneously.

5. In an electrical welding machine, a set of current conveying members having a plurality of contact pins, and a ball connection for'one of said members to permit compensating movements between said members. 6. In an electrical welding machine, an equalizer contact member having a universal .joint and a second contact member opposite thereto, said members movably related in respect to each other to bring pressure upon the material being welded, and one of said members having a plurality of contact pins socketed therein and adapted to make a plurality of welds.

7. In an ,electricalwelding machine, a reciprocable plunger and a set of current conveying contact members, one having a universally rotatable and frictionallocking connection with said plunger, and one of which is provided with a plurality of contact portions.

8. In an electrical welding machine, current conveying contact members having a plurality of contacts and a pivotal ball connection centrally disposed in respect to said contacts to ermit compensating movements and equal istribution of pressure thereto, ind means to apply pressure upon said memers.

9. An electrical weldin machine comprising a supporting stan ard and a mandrel, and a plunger movably mounted in said standard opposite said mandrel, a current conveyin ead havin a ball attachment with sai plunger, an a series of current conveying contact pins on said mandrel opposite said head.

10. An electrical welding machine having a reciprocable plunger provided with a bal shape end and a lever to o erate the same, a work support having a'p urality of conand a locking plate therefor,

tact pins, and a rocking member carried by said plunger and opposlte said pins, and our rent conveying connections leading to said.

vertically movable plunger above the same,

a counterwei'ghted lever to operate said plunger,- a current conveying head having a ball and socket connection with said plunger and a set of contact pins adapted to make'a plurality of welds at a single operation of 12. In an electrig l welding machine, a set of current conveying members, one of said members having a universal joint connection to permit universal tilting movements said machine.

thereof on diflerent radial lines, and a plurality of contact pins on one of said members radially disposed in respect to the center of movementof said joint, connection.

13. In an electrical welding machine, a set of current conveying contact members oppositely disposed and movablyrelated, one of said members having a ball said members having a contact in adapted to weld a relatively small area 0 metal.

In testimony whereof I sign this specification in the presence of two Witnesses;

WILLIAM (J. l/VINIELD.

Witnesses:

E. M. FISHER R. B. MOSER.

joint, and one of- 

